Makefile.docker

include Makefile.common

export PATH := ./build/scripts:$(PATH)

image_manifest_file = .docker/build_image_manifest

# We use git object hashes for determining the input files used for any given build image
# E.g. given `weaveworks/eksctl-build:e6e8800773d3adf8e7999a23dcdb07414c66a4da` one can
# run `git show e6e8800773d3adf8e7999a23dcdb07414c66a4da` to get contents of `.build_image_manifest`,
# and `git show <hash>` for each of the hashes in the manifest to determine contents of each of the
# files used in `$(build_image_input)` at the time.
build_image_tag_file = .docker/image_tag
build_image_tag = $(shell cat $(build_image_tag_file))

build_image_name = weaveworks/eksctl-build:$(build_image_tag)

intermediate_container_name = eksctl-build-$(unique_tag)

docker_build := time docker build
# We should eventually switch to buildkit, as it has a many feature and cleaner output with timing info,
# but right now 'docker build' doesn't allow us to export build cache images, so we cannot use it yet
# docker_build := env DOCKER_BUILDKIT=1 $(docker_build)

.PHONY: update-build-image-tag
update-build-image-tag:
	build-image-manifest.sh > $(image_manifest_file)
	git hash-object $(image_manifest_file) > $(build_image_tag_file)

.PHONY: check-build-image-manifest-up-to-date
check-build-image-manifest-up-to-date: update-build-image-tag ## Update build image manifest and commits the changes
	git diff --quiet -- $(image_manifest_file) \
	  || (git --no-pager diff $(image_manifest_file); echo "HINT: to fix this, run 'make -f Makefile.docker update-build-image-tag'"; exit 1)

.PHONY: commit-new-image-tag
commit-new-image-tag: update-build-image-tag ## Update build image manifest and commits the changes
	git commit --quiet $(image_manifest_file) $(build_image_tag_file) --message 'Update build image manifest and tag file'

.PHONY: build-image
build-image: check-build-image-manifest-up-to-date ## Build the build image that has all of external dependencies
	-docker pull $(build_image_name)
	cp .requirements build/scripts/install-build-deps.sh go.mod go.sum .docker/
	$(docker_build) \
	  --iidfile=.build_image.iid \
	  --cache-from=$(build_image_name) \
	  --tag=$(build_image_name) \
	  --file Dockerfile \
	  .docker/

.PHONY: push-build-image
push-build-image: build-image ## Push the build image to the Docker Hub registry
	docker push $(build_image_name)
	echo "Remember to commit the image_tag and build_image_manifest files"

.PHONY: intermediate-image
intermediate-image: build-image ## Build the intermediate image that has all artefacts
	time docker run \
	  --tty \
	  --name=$(intermediate_container_name) \
	  --volume=$(git_toplevel):/src \
	    $(build_image_name) /src/eksctl-image-builder.sh \
	  || (docker rm $(intermediate_container_name) ; exit 1)
	time docker commit $(intermediate_container_name) $(intermediate_image_name) \
	  && docker rm $(intermediate_container_name)

.PHONY: eksctl-image
eksctl-image: intermediate-image ## Build the eksctl image that has release artefacts and no build dependencies
	printf 'FROM scratch\nCMD eksctl\nCOPY --from=%s /out /' $(intermediate_image_name) \
	  | $(docker_build) \
	      --iidfile=.eksctl_image.iid \
	      --tag="$(eksctl_image_name)" -

.PHONY: build test
build test: ## Run targets from Makefile using the build image
	time docker run \
	  --tty \
	  --rm \
	  --volume=$(git_toplevel):/src \
	    $(build_image_name) make $@